A fallstreak hole — a circle that opens in the heavens
Imagine that it’s a cold day and the horizon is full of dense clouds. Suddenly, you see a large hole that you can see the sky through. This is not an announcement of the arrival of a UFO, it is called a skypunch or a fallstreak hole. It occurs when a large number of tiny ice crystals break into the cloud layer causing the droplets to evaporate. It’s all physics, but totally magical.